Describe a process in which energy changes forms at least twice. are there any unwanted forms of energy that are produced during the energy transformations?

Explanation:

Consider the example of the electric fan. The electrical energy used in the electric fan is greater than the kinetic energy of the moving fan blades.

According to the law of conservation of the energy, the energy is neither created nor destroyed. It always remains same.

The electrical energy used in the electric fan is also used in the producing unwanted sound energy.

The electrical energy in the electric fan is converted into any unwanted forms of energy. Like in producing unwanted sound energy and the heat energy. If the electric fan shakes then some of the electric energy is converted into unwanted kinetic energy.

Here, the electrical energy changes into sound energy, heat energy and kinetic energy.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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